Floatless carburetor



Aug. 1l, 1931. M. KREHER 1,818,068

FLOATLESS CARBURETOR Filed Dec. 10, 1928 3 Sheets-Sheet l Zena/2210224fafim ug. 11, 1931. M. KREHER 1,818,068

FLoATLEss CARBURETOR Filed Deo. 10, 1928 3 Sheets-Sheet 2 34 z ,if

` Aug. 1,1-,- 1931. M. KREHR FLOATLESS CARBURERTOR Filed Dec. 1o, 1928 3Sheets-Sheet 5 Patented Aug. 11, 1931 ET STATES PATENT` FF.

Mex Kennen, or FREIBERG, GERMANY, AssrGNOR To CURT LUDWIG, or ANNABERG,

` GERMANY FLOATLESS CARBURETOR Application led December 10, 1928, SerialNo. 324,995, and in Germany September 3, 1928.

Attempts have already been made to produce carburetors without oats, butthese attempts have not given a satisfactory result.

A carburetor without float must have, if it has to fulfill the practicalrequirements, a special construction with accurate calculation of allpoints important and favourable for the working. It is believed thatthis invention represents a type of floatless carburetor which is animportant improvement over all known types of carburetors and of greatimportance for use on motorcars, aircraft and the like.

Several embodiments of the invention are illustrated by way of examplein the accompanying drawings in which Fig. 1 shows the improvedcarburetor in vertical section7 partly in elevation.

Fig. 2 shows in top plan view a threearmed blade spring to be used incombination with the regulating pin.

' Fig. 3 shows incross section. a ring for supplying moisture to thesuction air and for regulating the free cross-section of the passage forthe explosive mixture.

Fig. 4 shows the regulating pin in elevation.

Fig. 5 shows in side elevation the regulating pin with mixing plate.

Fig. 5a is a top plan view of Fig. 5.

Fig. 6 is a cross section on line VI-VI of Fig. 1.

Fig. 7 shows in side elevation the benzine distributing'element shapedlike the rose of a water can.

Fig. 7 a is a plan view of Fig. 7 seen from below. l

Fig. 8 shows in cross section partly in elevation a carburetor of modiedconstruction.

, Fig. 9 shows in top plan view the interchangeable ring for holding theregulating needle.

Fig. 9a is a vertical section through Fig.`

Fig. 10 is a horizontal section through the fuel channel in Fig. 8.

Fig. 11 shows the benzine nozzle in vertical section.

Fig. 12 is a side elevation showing the regulating pin.

Figs. 13, 14 and 15 show each in vertical section a carburetor ofmodified construction.

Referring to Figs. 1 to 7 the carburetor casing is composed of two parts1 and 2 screw connected with each other. The upper part 1 comprises atransverse bar 3 having three arms and a vhub 4, (Figs. 1 and 6) saidupper part of the casing having a flange 5 at the top end. In part 1 ofthe casing a shaft 6 with throttle valve 7 is journaled. The part 2 o'fthe casing comprises a transverse bar 8 in which a channel 9 is bored.The casing has two tubular sockets, the tubular socket 10 serving forthe admission of water vand tapping into an annulargroove 11, and thetubular socket 12 forming an extension of the transverse bar 8 andserving for the admission of benzine. A nozzle insert 18 is in the outerend of the tubular socket 12. The flange 5 of the casing is connected tothe engine and the air iows in through the open lower end in thedirection of the arrow lines.

VOn the transverse bar 8 a bearing brass 14 is formed in which anelement 15 is inserted which I call a rose of a watering can. At thecentre of the lower surface of the element 15 a cavity 16 is arrangedfrom which extend in radial directions narrow grooves 15a over the lowersurface to the upper edge of said element (see Fig. 7 The element 15 isfixed in the bearing brass 19 by means of a screw 17. This screw isbored and the boring communicates with the benzine'channel 9. In theboring of screw 17 a valve seat 18 is arranged. Frein the boring ofscrew 17 extend laterally directedV channels 19 to the cavity 16.

The screw 17 and a regulating needle 20 in the same form together thefuel valve. The needle 17 has, as shown in Figs. 1, 4 and 5, a shuttingoff plate 2l for the passage of the mixture. Its point bears against theseat 18 and it is guided with a collar 22 in the boring of screw 17 andwith its upper end 23 in the hub 4 of the three armed transverse barp.Between a collar 24 of the regulating needle and the transverse bar 3 aspiral spring 25 is inserted.

The screw 17 and the needle 2O are made of rust lroof steel and one ofthe two elements (immaterial which one) must be tempered and the othernot tempered. The shuttingoif plate 21 1 and 5) which is made of lightmetal and has apertures 2G in the bottom plate loosely mounted von theregulating needle and coupled with. this needle by means of athree-armed blade spring 2 inserted in said plate 21. The needle and theplate are adjusted together and in dependence of each other. The plate2l is normally standing a short distance abovevan `ollset step 2S of theelement 15.

The following has to be explained:

At misignitions shocks are produced directed into the casing; they wouldmake the needle strike hardly against the seat 18 so that this seatwould be widened. In the form of construction described the plate 2lwill be pressed down by such shocks until it strilies against the offsetstep Q8, whereby the blade spring 27 is put under tension andelastically brakes thershoclr for the needle 20.

In the part 2 of the casing a ring 29 is removably inserted.,l the innerdiameter of which determines the width of the passage. Byaccordinglyselecting the inner diameter of ring 29, the widthof thepassage can be adjusted in accordance with the actual strength ofsuction of the motor. Into `the ring 29 an .annular groove 30 iscutwhich registers with the annular groove 11 and contains a wick 31 whichis continually moistened -by the water Vflowing in through thetubularsocket 10 and annular groove 11. From the 'bottom of groove 30 nozzleholes 32 extend `to `the inner surface of ring 29. The vacuum existing-in the suction draft attracts the moisture from wick 31 through thehole-s 332 so that -moisture isvcontinualiy absorbed by the suctiondraft. The moisture is very little7 only a moist vapour, but it has `theeffect to solidify the mixture.

lVhen the motor is being started the throttle valve 7 is only slightlyopen, to be opened wider according to requirement as soon as the engineis running. `vlBy the suction draft produced by the engine the needle 20and plate 21 are automatically raised and air is sucked through thechannel 9. The benzine flows into the boring of screw 7, thence throughthe nozzle holes 19 into the cavity 1G to be distributed through thegrooves 15o. Atthe upper edge of the element 15 the benzine, flowing outuniformly distributed, is Adrawn along by the suction air. Thisarrangement of element 15 ensures.anextraordinarily fine distribution ofthe benzine and a very intimate mixingof benzineandair so that aperfectly working combustible mixture is produced. A thorough mixing isfurther favoured by t ie arrangement of plate 21. As the mixture flowsaround this plate 21 and through its apertures 2G eddying on the outerside is produced besides intersecting inner `iets so that the mixture isthoroughly mixed again.

In the form of construction shown in Figs. 8 to 12 the regulating needle2O car- 4ries with the aid of a blade spring 33 a ring 34 which has aninner shoulder 35 and a transverse bar 8G with a central cavity 37. Thecollar of the needle 2O is inserted into this cavity 37 and the bladespring 33 connects the two elements. A spiral spring 38 rests on thering This ring is normally in such position that its shoulder a shortdistance above the offset portion 28. shock striking against the needleis neutralized as the ring 3l is pressed down against the offset step2Sg the blade spring braking elastically the shock for the needle 20. lnthis form of construction of the carburetor the valve is alsoautomatically opened by the suction draft as in the form of constructionabove described.

In the form of construction shown in l? ig. 13 the casing is cast in onepiece. The channel 9 extends through the transverse bar 8 from oneend tothe other.

Into this channel 9 a nozzle 559 is screwed, the boring of whichcon'in'iunicates by lateral channels d0 with an annular groove al. r'lhebenzine flows through the nozzle and through the annular groove to thecentral boring of screw 17. The valve is formed by av plug Ll? `mountedon a spiral spring 13. The valve chamber is closed at the lower end by ascrew fill. The pin of plug 4:2 projects from the casing. rlhe shaft 6of the throttle valve is rotated by a two-armed lever Ll5 and the pin ofthe plug is on the path of one-of the lever arms. The valve shuts oilvin the upper position. In this form of construction the valve is notopened by the suction draft but by depressing of plug l2 by means of oneof the arms of lever 4:5.

According to Fig. l14 abolt t7 controlled by a spiral spring 116 issituated inthe channel 9, said bolt having a central boringcommunicating by a laterally directed branch 18 with the cavity 1G ofthe element 15. A bolt controlled by a spring 49 forms a shutting offvalve. The bolt L17 has further a groove 51 in its outer surface and itis connected to a pull element to be operated from the drivers seat. 'lhe spring L16 pushes the boltf7 normally forward to shut off groove 51.In this form of construction the bolt 50 is at the starting of the`engine first operated automatically by the suction draft formed in thecylinder and is moved back by the pressure of the benzine in the centralboring of the bolt 17 against the action of the spring 19 therebyexposing the branch 118 and Vallowing the benzine to pass from theboring of the bolt 47 to the branch 48. The bolt 47 is not displaced bythe suction but remains in the closing position. For full running of theengine the bolt 47 is pulled to the left (Fig. 14) from the drivers seatso that groove 5l is made to communicate on the right end with thebenzine feed bore in the part l2 and on the left with the cavity 16.

Fig. l5 shows the channel 9 cut in the casing and joining a verticalchannel 9a in which a seat 18a is arranged for a valve body 52. Thevalve is lifted again by the suction draft.

l. A floatless carburetor, comprising in combination with the casing, atransverse bar in said casing having a boring forming a benzine channel,a bearing brass in said transverse bar, a rose-like head on said bearingbrass for finely distributing the benzine, a screw for clamping saidhead on said bearing brass and having a central boring' forming apassage for the benzine, a seat in the boring of said screw, aregulating needle in said boring bearing on said seat, a shutting olfplate having apertures in its bottom loosely mounted on said regulatingneedle, and a three armed blade spring coupling said plate with saidneedle so that they are adjusted together in dependence of each other.

2. A floatless carburetor, comprising in combination with the casing, atransverse bar in said casing having a boring forming a benzine channel,a bearing brass on said transverse bar, a rose-like head on said bearingbrass for nely distributing the benzine, a screw for clamping said headon said bearing brass and having a central boring forming a passage forthe benzine, a seat in the boring of said screw, a regulating needle insaid boring bearing on said seat, a shutting off plate having aperturesin its bottom loosely mounted on said regulating needle, and a threearmed blade spring coupling said plate with said needle so that they areadjusted together in dependence of each other the fuel and air mixtureflowing around.

said plate and in jets through said apertures of said plate so that itis again intimately admixed above said plate.

3. A floatless carburetor, comprising in combination with the casing, atransverse bar in said casing having a boring forming a benzine channel,a bearing brass in said transverse bar, a rose-like head on said bearingbrass for nely distributing the benzine having an offset step on itsouter surface, a screw for clamping said head on said bearing brass andhaving a central boring forming a passage for the benzine, a seat in theboring of said screw, a regulating needle 1n said boring bearing on saidseat, a shutting ofi" plate having apertures in its bottom looselymounted on said regulating needle, and a three armed blade springcoupling said plate with said needle so that they are adjusted togetherin dependence of each other, and a spiral spring resting on saidtransverse bar to equalize shocks resulting from misignitions.

4. A ioatless carburetor, comprising in combination with the casing, atransverse bar in said casing having a boring forming a benzine channel,a bearing brass in said transverse bar, a rose-like head on said bearingbrass for linely distributing the benzine, a screw for clamping saidhead on said bearing brass and having a central boring forming a passagefor the benzine, a seat in the boring in said screw, a regulating needlein said boring bearing on said seat, a shutting olf plate havingapertures in its bottom loosely mounted on said regulating needle, and athree armed blade spring coupling said plate with said needle so thatthey are adjusted together in dependence of each other said screw andneedle being of rust proof steel one of said elements being tempered andthe other not tempered.

In testimony whereof I affix mv signature.

MAX KREHER.

